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Integration Update 3 Updates to External Interface Specification Certain elements of the External Interface Specification were approved on May 21 st on condition that regular updates were provided to the specification Revision 1.02 was posted on July 20 th for review –Review feedback required by August 3 rd –Updated document will be republished by August 9 th –TPTF vote on August 14 th The changes in version 1.02 are –Removed deleteOutputSchedules from ThreePartOffer –Added statement related to ordering guarantees in section 2.6. –Added note regarding the handling of timestamps that are not interval aligned in section 2.3.2 –Corrected figure 10 to reflect use of INC or DEC type in mRID for IncDecOffers –Corrected Figure 9 to not have expiration column –Modified Figure 10 to add column to map protocol terms to XML tags –Modified sections 3.3.1, 3.3.3, 3.3.4, 3.3.5 and 3.3.11 to not use expirationTime as a key value –Corrected references to IrregularIntervalSchedule to be TmSchedule –Revised section 5.1 and Figure 109 to reflect revised notification scheme –Revised ASOffer structure, uses a variation of PriceCurve that provides price points for each specific AS type. This affects sections 3.3.4, 2.3.1, 2.3.3 and 2.3.4

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Integration Update 4 New services being built The services we are building for Aug 30 th release as loopback services are listed There will be no back-end functionality associated with these services in the Sandbox The back-end systems have not implemented these services yet and are subject to change The Market Information types will be simulated but we have not yet decided what the response will be –Simple document or XML response The services will be deployed to the EDS environment on the transition plan schedule New Market Transaction Services –Self Arranged Ancillary Services –Ancillary Services Offer –Ancillary Services Trade –DAM Energy Bid –DAM Energy Only Offer –Congestion Revenue Rights Offer –PTP Obligation Bid –Self Schedule New Market Information Services –Proxy Curves –Startup and Shutdown Instructions –Total Regulation –Load Ratio Share –Unit Availability –Forecasted Load –Real-Time System Load –Market LMPs and SPPs –Mitigated Curves New Notifications –Outage Notifications –Notices and Alerts –CRR Awards New Outage Scheduling Services –Outage Creation

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Integration Update 5 Sandbox & EDS deployment Following services are available –Three Part Offer –Incremental/Decremental Offers –Current Operating Plan –Output Schedule –Bid Set Acceptance –Bid Set Errors –Get mRID –System Status Defects are being posted here: –http://nodal.ercot.com/readiness/sandbox/documents/docs/Sandbox_Defects.xlshttp://nodal.ercot.com/readiness/sandbox/documents/docs/Sandbox_Defects.xls –Problem with optional fields being made mandatory Notifications system is functional but network configuration has to be reworked to get notifications through the DMZ Back-end integration with MMS enters test in early August for early EDS3 –Three Part Offer –Incremental/ Decremental Offers –Current Operating Plan –Output Schedule Pending sent through the general Notification service NOT –Bid Set Acceptance –Bid Set Errors

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Integration Update 7 Solution Use Case The following sequence of steps would be used to send a notification message to an MP system: 1.ERCOT Notification Service establishes an HTTPS connection to target MP system at port 443 of URL pre-specified by MP 2.Notify message is signed by ERCOT using the ERCOT server certificate (the same one used for external web services) 3.MP web service is invoked by ERCOT Notification Service, sending the Notify message 4.MP system validates the signature, using the ERCOT public key 5.Notify message is consumed by the MP system 6.MP system replies with a simple, unsigned Acknowledge message using the same HTTPS connection 7.ERCOT Notification Service receives Acknowledge message and marks the transmission as complete 8.Process is repeated for next notification or if a retry is needed according to established rules

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Integration Update 8 8 Solution Approach MPs can use any server certificate of their choosing for HTTPS connections to their web server ERCOT will not use a client certificate when establishing an HTTPS connection to a MP notification listener service There is no need to manage additional client certificates over those needed for the external web services, greatly simplifying ERCOT implementation and administration MPs must be able to read ERCOTs signature to verify that ERCOT sent the Notification MPs can not use Certificate Revocation Lists (CRLs), as ERCOT would not have a client certificate for each MP system Implementation is easier for MPs, as they dont need to sign the Acknowledge messages (there is only non-sensitive data on the Acknowledge)

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Integration Update 9 9 Steps to test Notifications & Listeners MPs must get a new Nodal Test Certificate from ERCOT. The detailed instructions for this request will be communicated through the EDS meetings MPs must get ERCOTs public certificate from their Client Services representative in order to read ERCOT signatures MPs must get the WSDL & XSD from ERCOT, published on http://nodal.ercot.com/readiness/sandbox/websvc/index.html http://nodal.ercot.com/readiness/sandbox/websvc/index.html MPs are responsible for constructing the Notification listener service, using whatever technologies suits MPs must notify ERCOT of the listener addresses (primary & secondary) and email details (via eds3@ercot.com)eds3@ercot.com MPs must set up their infrastructure to accept an https connection from ERCOT MPs can schedule time with ERCOT to test out the service – we will provide 1:1 time with developers (via eds3@ercot.com)eds3@ercot.com ERCOT verifies the service by sending a test Notification to the MPs service

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Integration Update 11 Sample test case Step Name DescriptionExpected Step 1Pick the attached sample 3PO valid xmlSample xml is successfully picked. Step 2set the followingChanges are reflected. verb = change Set FipFop value to 850 or make any other changes to payload/bidset Step 3Place this xml in the folder used by test harness clientXml is placed in the folder. Step 4A request is to be sent and a descriptive message is expected along with OkOk is expected. Step 5Do a "Get" request depending on the mrID from the step 4.A response reflecting the changes should be displayed Step 6Validate that change is reflected in the response message.Change should be visible. Step 7Once the test is complete set the xml back to its sample state.Xml is reset.

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Integration Update 12 Interface Design Process Identify Integrations –System of Systems Architecture (SoSA) describes the enterprise level integration points needed for the overall Nodal solution. –Integration Design Authority (Technical & Business Architects), project teams and integration vendors work together to produce artifacts Project Teams are accountable for determining what information they need –Project teams (CRR, MMS, CMM etc) create CSDs & Use Cases that indicate dependencies on information from other systems –Project teams determine what information is necessary and whether they can be supplied –Integration picks up from that point Interface Specifications & Design –Integration artifacts are produced that contain: Data Element Name, Element Attributes, Volumetrics, Data Frequency etc. Business Triggering Events that drive the movement of information –The integration teams use these artifacts to analyze the interface and develop Use Cases Identify gaps, integration characteristics, mismatches and transformations of data that is necessary between systems –Integrations specifications and Use Cases are the input to design and implementation of the integration between systems. Exceptions are handled through IDA and Design ClearingHouse –Cases where projects have made conflicting assumptions –Cases where integration discovers missing or incorrect information elements that do not match